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136 lines
3.5 KiB
ArmAsm
136 lines
3.5 KiB
ArmAsm
/* Optimized memset implementation using LoongArch LSX instructions.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/regdef.h>
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#include <sys/asm.h>
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#if IS_IN (libc) && !defined __loongarch_soft_float
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# define MEMSET __memset_lsx
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LEAF(MEMSET, 6)
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li.d t1, 16
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move a3, a0
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vreplgr2vr.b vr0, a1
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add.d a4, a0, a2
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bgeu t1, a2, L(less_16bytes)
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li.d t3, 64
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li.d t2, 32
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bgeu a2, t3, L(long_bytes)
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L(less_64bytes):
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bgeu t2, a2, L(less_32bytes)
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vst vr0, a3, 0
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vst vr0, a3, 16
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vst vr0, a4, -32
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vst vr0, a4, -16
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jr ra
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L(less_32bytes):
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vst vr0, a3, 0
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vst vr0, a4, -16
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jr ra
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L(less_16bytes):
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srli.d t0, a2, 3
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beqz t0, L(less_8bytes)
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vstelm.d vr0, a3, 0, 0
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vstelm.d vr0, a4, -8, 0
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jr ra
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L(less_8bytes):
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srli.d t0, a2, 2
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beqz t0, L(less_4bytes)
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vstelm.w vr0, a3, 0, 0
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vstelm.w vr0, a4, -4, 0
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jr ra
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L(less_4bytes):
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srli.d t0, a2, 1
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beqz t0, L(less_2bytes)
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vstelm.h vr0, a3, 0, 0
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vstelm.h vr0, a4, -2, 0
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jr ra
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L(less_2bytes):
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beqz a2, L(less_1bytes)
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vstelm.b vr0, a3, 0, 0
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L(less_1bytes):
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jr ra
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L(long_bytes):
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vst vr0, a3, 0
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bstrins.d a3, zero, 3, 0
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addi.d a3, a3, 16
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sub.d a2, a4, a3
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andi t0, a2, 0x7f
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beq t0, a2, L(long_end)
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move a2, t0
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sub.d t0, a4, t0
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L(loop_128):
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vst vr0, a3, 0
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vst vr0, a3, 16
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vst vr0, a3, 32
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vst vr0, a3, 48
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vst vr0, a3, 64
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vst vr0, a3, 80
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vst vr0, a3, 96
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vst vr0, a3, 112
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addi.d a3, a3, 128
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bne a3, t0, L(loop_128)
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L(long_end):
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bltu a2, t3, L(end_less_64)
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addi.d a2, a2, -64
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vst vr0, a3, 0
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vst vr0, a3, 16
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vst vr0, a3, 32
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vst vr0, a3, 48
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addi.d a3, a3, 64
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L(end_less_64):
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bltu a2, t2, L(end_less_32)
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addi.d a2, a2, -32
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vst vr0, a3, 0
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vst vr0, a3, 16
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addi.d a3, a3, 32
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L(end_less_32):
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bltu a2, t1, L(end_less_16)
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vst vr0, a3, 0
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L(end_less_16):
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vst vr0, a4, -16
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jr ra
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END(MEMSET)
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libc_hidden_builtin_def (MEMSET)
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#endif
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